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Install the latest Windows Defender definition updates

Windows Defender is a free program that helps protect your computer against pop-ups, slow performance, and security threats caused by spyware and other unwanted software. It features Real-Time Protection, a monitoring system that recommends actions against spyware when it's detected and minimizes interruptions and helps you stay productive.

Revision Information:
Revision 2: Modified applicability to detect that Windows Defender is enabled. DAT files cannot be successfully applied to Windows Defender if it is not enabled on the endpoint.